> On Jul 18, 2018, at 2:23 PM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote: > > On Wed, Jul 18, 2018 at 01:22:19PM -0400, Rik van Riel wrote: >>> On Jul 18, 2018, at 12:00 PM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote: > >>> Also, I don't suppose you've looked at the paravirt instances of >>> flush_tlb_other() ? They don't elide the flushes because of lazy. >> >> Let me look at those now :) > > <snip xen> > >> kvm_flush_tlb_other takes out preempted VCPUs from the flush mask, >> before calling native_flush_tlb_others, so it should get the optimization >> automatically. > > Ah, ok. I wasn't entirely sure the new lazy was purely for the idle > case. But yes, the KVM paravirt thing should get the idle case right. > Not just idle, but also running in kernel threads like ksoftirqd, kworker, kswapd, etc. However, kvm_flush_tlb_other calls native_flush_tlb_other, so it should get that optimization automatically from my patch series. -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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